Although not landfill related, biters do seem to have some big issue. All over my map they just bunch together and wait for better days? Can you make them more aggressive so that they don't bunch together for days before attacking. Currently this map run at 34 UPS, which I noticed after updating to v 16.16, but it could have started before then because I recently flew around and attacked some for fun. Either case, when I delete all enemies via console my UPS jump back to a stable 60 again. And as you can see my base is not really that big yet. (Still need to setup red circuits, blue circuits, stone, oil and science. Where will my UPS end then?
Also note that I started this map without expansion on and activated it via console a few days ago. Also, you will have to have mod Dectorio enabled since no power will be on without Dectorio's signals.